Audio
Polarity test signal
Asymmetric pulse — check that drivers and speaker pairs move the same way.
A short pulse with a fast rise and slow decay, fired once per second to left, right or both. Watch each cone: on the same pulse they should jump the same direction first. This verifies relative polarity between drivers or pairs — the browser, OS, DAC and amp chain may each invert, so absolute polarity needs a hardware phase checker.
press start to begin a 1 Hz pulse loop
pulse
Polarity
Output
how to use
- ▸ This checks relative polarity — whether two drivers or two speakers move the same way on the same pulse. Pick L, watch the cone, then R: both should jump the same direction first. If one goes out and the other goes in, one is wired backward.
- ▸ It cannot tell you absolute polarity. The browser, OS mixer, DAC and amp may each invert, and none of that is visible here — so "positive" is only positive at this page's output. For absolute checks use a hardware phase checker (pulse + mic) or a 9 V battery across the terminals.
- ▸ Pulses fire once per second so you have time to walk to the speaker and watch. Longer pulses (50–100 ms) make the excursion easier to see on woofers; keep the level low.
- ▸ Use L + R for a mono / summed feed into a DSP where you'll route per output from there.